Cementing and floating shoe for well casings



March 19, 19350 c. E. BURT 1,994,850

CEMENTING AND FLOATING SHOE FOR WELL CASINGS Filed June 25, 1950' 26 'INVENTOR.

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TTORNEYS.

atomized Mar. 19, 1,994,850

UNITED STATES PATENT OFFICE i ILWM- oslmumo gp snos FOB Clarence E. Burt, LOG Angeles. pm., asslznor to Baker Oil Tools, Inc., Huntington Park, CaliL, a corporation of California Application June :5. mo, Serlal'No. 403.862

z Claimslol; 166-!) I This invention relates to well cementing de- I Fig. 4 is a transverse section taken on line vicesand apparatus. IV--IV of Fig. 2. I Hitherto a cementing device has been produced 1 5 13a, fragmentary i w in transverse secwhich included a casing shoe having a cementition taken through one of the 51 m-n v v 5 tious plug cast therein. This cementitious plug of r i 5 is formed with a central valve chamber from the R f i more particularly t the accompanyopposite ends of which extends a comparatively mg drawing, in m 1 1 have illustrated gaging small passageway through both the upper and shoe in which is cylindrical and within which a. lower endseof the plug- A W1 valve i arranged cementitious plug 11 is cast. Grooves 12 are in this chamber which valve buoyant in fluid formed in the interior surface of the shoe 10 so 10 cement and is adapted to cooperate with a valve that-interlocking connections may be farmed seat at the upper end of the valve chamber so tween h plug 11 and the casing shoe 80 as t as to prevent the passage of fluid upwardly. revent dislodgment f the lug by mm a through the plug. Means are provided, however, to either end p p p Preventing the ball valve from bstmctmg the Formed in the plug is a valve chamber 14, the

flow of fluid through the lower end of the plug upper end of which 13 defined by a flat disc 15 mm the Valve 'v' preferably 01 bakelite or other similar non- This P1101 device when used cementing metallic but friable material. The lower end of I maintained oil the bottom of the wellinorder that the chamber 14 is defined by a concave disc 5 2o;the cement could discharge through the lower which is m fo med of hakehte or similar passage and force itself upwardly around the shoe. matena1. Extending between these discs 15 and I some instances however; it is desirable 16 is a cylinder 11, also formed or non-metallic Plement this s g with passageways material, the ends of which'project into grooves e the Valve chamber WWW formed in the adjacent surfaces oi the discs 15 throughflle 8168s of the shoe- I and 16. It will be noticed that the peripheral 25 It is the principal object of the presentinvenedges; the u 15 and 5 extend beyond t tion to provide a device or the character referred outer peripheral u f r the cylinder 17 and to wherein outlet passageways are provided which are anchored within the cemehtmous body extend radially irom the valve chamber and term f the plug minating at their outer ends in helical nozzles so An upper passageway 13 is formed coaxlafly 30 designed that ejected cement will be filmed oi the plug and extends between the valve cham- .inan upward helical pa substantially her 14 and the space interiorly oi the shoe above esntially theouter Periphery of the the plug. A valve seat 19 is formed at the lower In carrying this object into practice radim t e end of the passageway 13, A imilar passageway sageways are form from WW8 20 is formed in the plug from the lower endo! the 35 through the Plug and the outer surface the valve chamber through the lower end or the plug. shoe is formed with upwardly directed helical ms way is as mustmte-d m alignment slots directed substantially tangential to the outer with the ewa'y Alba 21 is my periphery of the shoe. Batlie means cooperate 40 with these slots so that the-ejected cement will 3: 2:21: ig gg g fi z gx f g g 40 flow in a helical path around the shoe and tanreality a back pressure valve. and is preferably gential to the surface thereof. The advantage ofthisistoprevent an undesirable washing action msuch mud as hydraulic cement 56 that when the pressure. enters into the valve on the sides of the hole. and also to plovide even e 5 distribution oi? the cement around the shoe and chamber 14 from the 20 the ban valve 21 will rise and seat on the seat 19 and to prevent channeling o! the cement. t n t One form whichthe invention fiiay assume is m z o1 um upwardly l exemplified in the following 'desc ption and 11- lustrated by way of example in the accompa Wm radially m the valve chamber 14 5o drawinginw'hich: is a plurality o! radial passageways 22. These Fig. 1 is a vertical transverse section through a passageways m? radially outwardly dj e shoe embodying 'the preferred form of my in-- ill sllghtlyupwardly. In the present iiivention. stance I have illustrated four of these radial Fig. 2 is a side elevation of tiles. c aways spaced at equal distances apart.

" Pig. 3 is a partial side elevation. e inner endls of these radial passageways v? communicate with the interior of the valve chamber 14. The outer ends oi! thepassageways communicate with nozzles 23 formed in the shoe 10. These nozzles 23 comprise substantially helical slots 24 formed in the shoe 10. These slots are arranged on an angle of substantially forty-five degrees-to a vertical line parallel to the axis of to a point a short distance above the port 25 as illustrated in Fig. 2. These bame plates 26 are preferably secured in place in such-a manner that they will not become dislodged after the device is assembled. 1

It will therefore be seen that a nozzle which is helically and upwardly directed and which is substantially tangent to the shoe 10 is iormedin the shoe at the end of each of the radial passageways 22. Therefore, cement ejected from the passageways 22 through the nozzles 23 will be caused to travel in a path which is both helical and tangent with respect to the shoe. This will insure distribution of the cement around the shoe and also prevent channeling of the cement.

When the device is in operation cement is forced downwardly unseating the ball valve 21 and causing the cement to eject radially outwardly through the passageways 22 and through the nozzles 23. It circulation is established through the passageway 20 cement will also eject through this passageway. However, it circulation is not established through this lower passageway a perfect cementing job will be insured through the medium of the passageways 22 and the nozzles 23.

' The forming of the nozzles 28 prevents an undesirable washing action on the walls of the hole and also insures .even distribution of the cement around the shoe.

Although I have illustrated and described the device as a cementing'shoe, the invention may be applied equally as well to a float collar; that is,

the cementitious plug may be cast in a coupling interposed between sections of well casing as well as in a casing shoe which is fitted at the lower end oi! the well casing.

While I have shown the preferred form of my invention, it is to be understood that various changes may be made by those skilled in the art without departing from the spirit oi. the invention as defined in the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

l. A cementing device of the character de-.

scribed including a cylindrical member, a substantially solid plug 01 cementitious material formed therein, said plug having a valve chamher formed therein and communicating'with the interior of the cylindrical member above the plug, valve means in said chamber for preventing the of fluid upwardly through said chamber into said cylindrical member above the plug. a plurality of radial passageways formed in said plug and extending from saidvalve chamber to the inner periphery of said cylindrical member, a nozzle formed in the cylindrical member for each passageway, each 01' said nozzles including a port formed through the cylindrical member in communication with the adjacent radial way. a groove extending upwardly and helically from the port with its bottom disposed on a tangent to the outer periphery of the shoe, and baiiie means disposed overv the port and having its inner surface spaced from the bottom of the groove to direct fluid emanating from port upwardly through the groove, said plug being also provided with upper and lower vertically aligned passageways extending from the chamber to the top and bottom of the plug and forming a straight opening through the plug.

2. A cementing device for well casings comprising a tubular cylindrical member adapted to beconnected to the well casing, a plurality of nozzles formed in said cylindrical member, each 40 of said nozzles including a port formed radially through the cylindrical member, a groove formed in the outer surface oi! said cylindrical member extending upwardly and helically from the port with its bottom disposed on a tangent to the outer' u periphery of said member, and a stationary baiile means for each nozzle; the same being disposed over the port and partly over the groove and secured to said member and having its inner surface spaced from the bottom of the groove to I.

direct fluid emanating from the port upwardly through the groove.

CLARENCE E. BURT. 

